BRUEL & KJAER 2230 - AC Recording Calibration

2230/2317
Internal Sound Source Pistonphone + Int. Ref. +
4230 +
Settings
Reference 4230 Attenuator Attenuator Attenuator
REF.-OPERATE
"Ref. " " Operate"
" Operate " "Ref."
"
Operate "
FSD " 11 0"
"
11 0" "(140)"
"(
11 0)" " (11 0)"
RESET "All"
"All" "All " "All" "All"
FREQ. WEIGHTING
irrelevant
irrelevant "Lin." i rrelevant irrelevant
EXT. FILTER
"
Out "
"
Out " " Out " " Out " " Out "
SOUND
INCIDENCE
"Frontal"
"Frontal"
irrelevant
" Frontal " " Frontal "
DISPLAY
"SPL"
"SPL"
"SPL"
"SPL" "SPL"
TIME
WEIGHTING
" Fast "
"
Fast " "Fast " " Fast "
"Fast"
DETECTOR
"RMS"
"RMS " "RMS " "RMS"
"RMS"
POWER
"On"
" On" "On " "On" "On"
PEN LIFT & STAND BY
Out position Out position Out position Out position Out position
SIGNAL MODE
" DC+ " "DC+" " DC+ " " DC+ " " DC+ "
AC
AVERAGING Irrelevant Irrelevant Irrelevant Irrelevant Irrelevant
AC DYN. RANGE Irrelevant Irrelevant Irrelevant Irrelevant Irrelevant
PAPER SPEED
"1 mm/s " "1 mm/s" "1 mm/s" "1 mm/s " "1 mm/s"
PAPER DRIVE On On On On On
POWER On On On On On
PEN SPEED
"Normal" "Normal" "Normal " "Normal " " Normal "
COARSE SENSITIVITY " Ground " "Ground " " Ground"
" Ground "
"
Ground "
DC
OFFSET Position " A"
Position "A"
Position "A "
Position " A" Position "A "
COARSE SENSITIVITY
"1 V" "1 V" "1 V" "1 V" "1 V"
FINE
SENSITIVITY Position "B"
Position "B" * Position "B " * Position "B" Position "B" *
* Sound Calibrator must be on
TOOBOOGBO
ODODOOOOOOOOOC 00000000 poooooooo 0 0 0 0 0 0 0 0 c 000000000
000000000
Scale top
100
®
100
®
130
®
100
®
100
®
90 90
120
90
90
80
80
110
80
80
44 dB + K
0
_ 43,8 dB _
44 dB
_ 44 dB + K
0
43 ,8 dB =
70 -
70- 100 -
-
70 -
70
60 60 90 60
60
Scale
bottom 50 50
80
50
50
OP 0102
®
®
® ®
®
85 098 7
Fig. 4.5. DC Recording Calibration settings
4.1.2. AC Recording Calibration
Calibration with AC recording is much easier than that of DC recording as in most cases
use can be made of the
Level Recorder precalibrated sensitivity settings. The different
calibration methods corresponding to the different reference sources (with or without the
Sound Level Meter 20 dB Input Attenuator fitted) are summarized in Fig.4.6. The table
gives the appropriate control settings and indicates how to obtain the reference posi-
tions shown in the figure just underneath.
24
Before proceeding with calibration, carry out the preliminary checks on Sound Level
Meter, Sound Source (if used) and Level Recorder.